There is no clear definition of what constitutes Anglo-Welsh poetry, and the term tends to be replaced by the broader "Welsh writing in English" or Welsh literature in English. It includes poetry written by Welsh people whose first language is English, but it also includes poetry by those born outside Wales, but of Welsh descent, whose work is influenced by their Welsh roots. Glyn Jones, in The Dragon Has Two Tongues, defines Anglo-Welsh writers as "those Welsh men and women who write in English about Wales" (p. 37).
Welsh poetry in English is not necessarily influenced by the historically much longer, and parallel, tradition of poetry in Welsh, but it may be influenced by the English dialects of Wales.

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The first-known poem in English by a Welshman was Hymn to the Virgin written c.1470 by Ieuan ap Hywel Swrdwal. Well into the nineteenth century, English was spoken by few in Wales, and prior to the early twentieth century there are only three major Welsh-born writers who wrote in the English language: George Herbert (1593â€“1633) from Montgomeryshire, Henry Vaughan (1622â€“1695) from Brecknockshire, and John Dyer (1699â€“1757) from Carmarthenshire. Such Welsh poets who wrote in the English language tended to imitate the conventions of English verse and only in translations from the Welsh did a national voice succeed in making itself heard.[1]
Some see the beginnings of true Anglo-Welsh poetry in the work of poets such as Gerard Manley Hopkins (1844â€“89), Edward Thomas (1878â€“1917), and Wilfred Owen (1893â€“1918).

Welsh writing in English is generally seen as beginning in the twentieth century,[2] following the decline of the Welsh language.
A memorable twentieth-century poet who initially wrote in Welsh was Idris Davies (1905â€“53). But "rebellion against chapel religion", along with the "inspirational influence of English" poets, led him to write in English (Gwalia Deserta (1938); The Angry Summer (1943)).
A major Welsh poet is Swansea's Dylan Thomas (1914â€“53) whose first collection, 18 Poems, was published in 1934. His most celebrated work, including Under Milk Wood (first broadcast in 1954), was published after the Second World War. While David Jones (1895â€“1974) was born in a London suburb, his father was from North Wales. Jones' epic poem In Parenthesis, which deals with his experience of World War I, was published in 1937, though he too belongs more to the post-war era, as does another Swansea poet Vernon Watkins (1906â€“67).

See above for Dylan Thomas, David Jones, & Vernon Watkins
R.S. Thomas (1913â€“2000) was the most eminent Welsh poet writing in English throughout the second half of the twentieth century, beginning with The Stones of the Field (1946) and concluding with No Truce with the Furies (1995).[3]
In the latter part of the twentieth century, Welsh poetry in English flourished. A landmark event was the 1967 publication of Bryn Griffith's anthology Welsh Voices. Tony Conran (1931- ) is an important figure in this so-called second flowering as critic, poet, and translator of Welsh poetry. His Penguin Book of Welsh Verse (1967) has been especially helpful in bridging the gap between the Welsh and English speaking. Swansea poet Harri Webb's (1920â€“1994) verse, including The Green Desert (1969), is marked in its themes by his radical and uncompromising commitment to Welsh nationalist politics. Another prominent poet of the late twentieth century is Tony Curtis (1946- ) from Carmarthen. John Tripp (1927â€“86), a convinced Welsh nationalist, had worked outside Wales until his early forties. Robert Minhinnick, born in 1952, is also a notable poet from the second half of the twentieth century and edited Poetry Wales magazine from 1997 to 2008.
Welsh writing in English from the beginning tended to be dominated by men, but the period after World War II produced some distinguished Welsh women poets, including Ruth Bidgood (1922- ), Gillian Clarke (1937- ), and Sheenagh Pugh (1950- ).
Amongst other poets of the second half of the twentieth century, the names of Roland Mathias (1915â€“2007), Leslie Norris (1921â€“2006), John Ormond (1923â€“90), Dannie Abse (1923- ), Raymond Garlick (1926- ), Peter Finch (1947- ), and perhaps also Paul Groves (1947- ) have a significant place. With regard to the current situation of Welsh poetry in English, Ian Gregson suggests that "much of the most exciting poetry in Britain is being written in Wales." He singles out Oliver Reynolds (1957- ), Gwyneth Lewis (1959- ), and Stephen Knight (1960- ) as having fulfilled "their early promise." [4]